一种变积分时间谐波检测算法  

Harmonic detection algorithm with variable integration time

作　　者：宋潇 SONG Xiao(School of Electrical Engineering,Shannxi University of Technology,Hanzhong 723001,China)

机构地区：[1]陕西理工大学电气工程学院,陕西汉中723001

出　　处：《现代电子技术》2022年第23期144-148,共5页Modern Electronics Technique

基　　金：陕西省教育厅专项科研计划项目:大规模电动汽车接入对配电网的影响及综合治理研究(21JK0577);陕西理工大学科研项目:有源滤波技术在电力系统谐波抑制中的研究与应用(SLG1911)。

摘　　要：为了解决广泛使用电力电子技术和新能源接入给电力系统带来的谐波污染问题,提高电网电能质量,针对传统瞬时无功谐波电流检测算法的弊端,提出一种变积分时间谐波检测算法。通过采用锁频环降低电网电压畸变带来的影响,并由低通滤波器和变积分平均值算法构成滤波环节,实时采集电网三相电流,通过计算有功和无功电流分量的相似度得到交流分量周期的最小公倍数(积分时间),同时采用时间步长因子对积分时间进行调节校正,并设置约束条件,保证算法的收敛性和鲁棒性,实现积分时间可以随检测电流的变化而自动调节。通过对比证明此方法可以有效提高谐波检测算法的精度和动态响应速度。最后通过在Matlab/Simulink平台仿真验证了变积分谐波检测方法的精确性和可靠性。This paper strives to solve the harmonic pollution problem caused by the extensive use of power electronic technology and the fact that the new energy is accessed to the power system,so as to improve the power quality of the power grid.In allusion to the disadvantages of the traditional instantaneous reactive harmonic current detection algorithm,a variable integration time harmonic detection algorithm is proposed.In this algorithm,the frequency⁃locked loop is used to reduce the influence of voltage distortion of power grid,and low⁃pass filter and variable integral average algorithm are used to form a stage of filtering to collect the three⁃phase current of power grid in real time.By calculating the similarity between active and reactive current components,the least common multiple(integration time)of AC component period is obtained.At the same time,the integration time is adjusted and corrected by time step factor,and constraint conditions are set to ensure the convergence and robustness of the algorithm,so that the integration time can be automatically adjusted with the change of detection current.By comparison,it is verified that the method can effectively improve the accuracy and increase the dynamic response speed of the harmonic detection algorithm.Finally,the accuracy and reliability of the variable integration harmonic detection algorithm has been verified by simulation on the Matlab/Simulink.

关 键 词：谐波检测 ip⁃iq谐波检测算法 锁频环 低通滤波器 平均值算法 变积分 积分时间 

分 类 号：TN709-34[电子电信—电路与系统] TM76[电气工程—电力系统及自动化]